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/* $Id: polygon.c,v 1.1 2003-02-28 11:42:04 pj Exp $ */

/*

 * Mesa 3-D graphics library

 * Version:  4.1

 *

 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

#include "glheader.h"

#include "imports.h"

#include "context.h"

#include "image.h"

#include "enums.h"

#include "macros.h"

#include "polygon.h"

#include "mtypes.h"

void

_mesa_CullFace( GLenum mode )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glCullFace %s\n", _mesa_lookup_enum_by_nr(mode));

   if (mode!=GL_FRONT && mode!=GL_BACK && mode!=GL_FRONT_AND_BACK) {

      _mesa_error( ctx, GL_INVALID_ENUM, "glCullFace" );

      return;

   }

   if (ctx->Polygon.CullFaceMode == mode)

      return;

   FLUSH_VERTICES(ctx, _NEW_POLYGON);

   ctx->Polygon.CullFaceMode = mode;

   if (ctx->Driver.CullFace)

      ctx->Driver.CullFace( ctx, mode );

}

void

_mesa_FrontFace( GLenum mode )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glFrontFace %s\n", _mesa_lookup_enum_by_nr(mode));

   if (mode!=GL_CW && mode!=GL_CCW) {

      _mesa_error( ctx, GL_INVALID_ENUM, "glFrontFace" );

      return;

   }

   if (ctx->Polygon.FrontFace == mode)

      return;

   FLUSH_VERTICES(ctx, _NEW_POLYGON);

   ctx->Polygon.FrontFace = mode;

   ctx->Polygon._FrontBit = (GLboolean) (mode == GL_CW);

   if (ctx->Driver.FrontFace)

      ctx->Driver.FrontFace( ctx, mode );

}

void

_mesa_PolygonMode( GLenum face, GLenum mode )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glPolygonMode %s %s\n",

                  _mesa_lookup_enum_by_nr(face),

                  _mesa_lookup_enum_by_nr(mode));

   if (mode!=GL_POINT && mode!=GL_LINE && mode!=GL_FILL) {

      _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(mode)" );

      return;

   }

   switch (face) {

   case GL_FRONT:

      if (ctx->Polygon.FrontMode == mode)

         return;

      FLUSH_VERTICES(ctx, _NEW_POLYGON);

      ctx->Polygon.FrontMode = mode;

      break;

   case GL_FRONT_AND_BACK:

      if (ctx->Polygon.FrontMode == mode &&

          ctx->Polygon.BackMode == mode)

         return;

      FLUSH_VERTICES(ctx, _NEW_POLYGON);

      ctx->Polygon.FrontMode = mode;

      ctx->Polygon.BackMode = mode;

      break;

   case GL_BACK:

      if (ctx->Polygon.BackMode == mode)

         return;

      FLUSH_VERTICES(ctx, _NEW_POLYGON);

      ctx->Polygon.BackMode = mode;

      break;

   default:

      _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );

      return;

   }

   ctx->_TriangleCaps &= ~DD_TRI_UNFILLED;

   if (ctx->Polygon.FrontMode!=GL_FILL || ctx->Polygon.BackMode!=GL_FILL)

      ctx->_TriangleCaps |= DD_TRI_UNFILLED;

   if (ctx->Driver.PolygonMode) {

      (*ctx->Driver.PolygonMode)( ctx, face, mode );

   }

}

void

_mesa_PolygonStipple( const GLubyte *pattern )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glPolygonStipple\n");

   FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);

   _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);

   if (ctx->Driver.PolygonStipple)

      ctx->Driver.PolygonStipple( ctx, (const GLubyte *) ctx->PolygonStipple );

}

void

_mesa_GetPolygonStipple( GLubyte *dest )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glGetPolygonStipple\n");

   _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);

}

void

_mesa_PolygonOffset( GLfloat factor, GLfloat units )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);

   if (ctx->Polygon.OffsetFactor == factor &&

       ctx->Polygon.OffsetUnits == units)

      return;

   FLUSH_VERTICES(ctx, _NEW_POLYGON);

   ctx->Polygon.OffsetFactor = factor;

   ctx->Polygon.OffsetUnits = units;

   if (ctx->Driver.PolygonOffset)

      ctx->Driver.PolygonOffset( ctx, factor, units );

}

void

_mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_PolygonOffset(factor, bias * ctx->DepthMaxF );

}